Method and apparatus for cutting superposed webs
CA 2213642 C · Owner: Wierschke, Larry D. · Inventors: Wierschke, Larry D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of cutting an elongated multi-ply flat surfaced ribbon of web material (19) which includes advancing the ribbon along a linear path while rotating a pair of cantilever-mounted drums (29 29') on opposite sides of the , path to flank the ribbon flat surfaces the drums each having a plurality of , axially extending slots in the periphery thereof. A saw blade (23) is adjacent the path and orbits through the path so as to have the blade orbit intersect the drum slot orbits to transversely cut the ribbon while the saw is advancing parallel to the linear path.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 27, 1996 and granted November 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.